Benchmark: For + Push vs Map

Script Preparation code:

var arr = Array.from(new Array(10000)).map((_, index) => index);
var result = [];

Tests:

For + Push
for (let i = 0; i < arr.length; i++) { result.push(arr[i]) }
Map
result = arr.map((a) => a)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For + Push
Map

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36

Browser/OS: Chrome 92 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
For + Push	201.0 Ops/sec
Map	4949.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark definition and test cases to understand what's being tested.

**Benchmark Definition JSON**

The provided benchmark definition represents a JavaScript microbenchmark that compares two approaches: using `for` loop with `push()` method versus using `map()` function. The script preparation code creates an array of 10,000 elements and stores it in the `arr` variable. It then initializes an empty array `result`.

**Test Cases**

There are two test cases:

1. **For + Push**: This test case uses a traditional `for` loop to iterate over the `arr` array and pushes each element into the `result` array.
2. **Map**: This test case uses the `map()` function to create a new array with the same elements as the original `arr` array.

**Comparison**

The benchmark is testing the performance of these two approaches:

* **For + Push**: This approach iterates over the array using a traditional loop, pushing each element into the result array.
* **Map**: This approach uses the `map()` function to create a new array with the same elements as the original `arr` array.

**Pros and Cons**

Here are some pros and cons of each approach:

* **For + Push**:
	+ Pros: More control over iteration, can be more efficient for small arrays or specific use cases.
	+ Cons: Can be slower due to the overhead of loop control and array indexing.
* **Map**:
	+ Pros: More concise and expressive, can be faster for large arrays or when working with functions that take a callback.
	+ Cons: May have additional overhead due to function calls and lambda expressions.

**Library**

There is no specific library mentioned in the benchmark definition. However, `map()` function is a built-in JavaScript method.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes used in this benchmark.

**Other Alternatives**

For large arrays or performance-critical code, other alternatives to consider:

* Using `forEach()` instead of `for` loop for iteration.
* Utilizing SIMD instructions (e.g., using WebAssembly) for parallel processing.
* Leveraging just-in-time (JIT) compilers or ahead-of-time (AOT) compilation to optimize performance.

**Benchmark Preparation Code**

The script preparation code creates an array of 10,000 elements and stores it in the `arr` variable. The `Array.from()` method is used to create a new array from an array-like object.
```javascript
var arr = Array.from(new Array(10000)).map((_, index) => index);
```
The `map()` function is applied to each element in the original array, creating a new array with the same elements.

Related benchmarks:

For + Push vs Map (version: 0)

Comparing performance of: For + Push vs Map

Created: 2 years ago by: Guest

Jump to the latest result

For + Push

Map

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):